PDFCrack - A Password Recovery Tool for PDF-files(Windows version)

About PDFCrack

PDFCrack is a GNU/Linux (other POSIX-compatible systems should work
too) tool for recovering passwords and content from
PDF-files. It is small, command line driven without external
dependencies. The application is Open Source (GPL).

Features

Supports the standard security handler (revision 2, 3 and 4) on all known PDF-versions

Supports cracking both owner and userpasswords

Both wordlists and bruteforcing the password is supported

Simple permutations (currently only trying first character as Upper Case)